BGP NSR Support for iBGP Peers

BGP NSR provides BGP nonstop routing (NSR) and nonstop forwarding (NSF) in the event of a switchover from an Active RP to the Standby RP. The BGP NSR Support for iBGP Peers feature provides NSR support for iBGP peers configured under the IPv4 unicast or IPv4 + label address family.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see
Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to
www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Restrictions on BGP NSR Support for iBGP Peers

Benefit of BGP NSR Support for iBGP Peers

Nonstop routing is beneficial for iBGP peers because it reduces the likelihood of dropped packets during switchover from the Active RP to the Standby RP. Switchover occurs when the Active RP fails for some reason, and the Standby RP takes control of Active RP operations.

How to Configure BGP NSR Support for iBGP Peers

Making an iBGP Peer NSR-Capable for the IPv4 Address Family

SUMMARY STEPS

1.enable

2.configureterminal

3.routerbgpautonomous-system-number

4.address-familyipv4[unicast |
vrfvrf-name]

5.neighborip-addressremote-asas-number

6.neighborip-addressactivate

7.neighborip-addressha-mode sso

8.end

DETAILED STEPS

Command or Action

Purpose

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password if prompted.

Step 2

configureterminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

routerbgpautonomous-system-number

Example:

Device(config)# router bgp 4000

Enters router configuration mode for the specified routing process.

Step 4

address-familyipv4[unicast |
vrfvrf-name]

Example:

Device(config-router)# address-family ipv4 unicast

Specifies the IPv4 address family and enters address family configuration mode.

The
unicast keyword specifies the IPv4 unicast address family.

The
vrf keyword and
vrf-name argument specify the name of the virtual routing and forwarding (VRF) instance to associate with subsequent IPv4 address family configuration mode commands.

Step 5

neighborip-addressremote-asas-number

Example:

Device(config-router-af)# neighbor 192.168.1.1 remote-as 4000

Specifies the autonomous system of the neighbor.

Step 6

neighborip-addressactivate

Example:

Device(config-router-af)# neighbor 192.168.1.1 activate

Activates the specified peer.

Step 7

neighborip-addressha-mode sso

Example:

Device(config-router-af)# neighbor 192.168.1.1 ha-mode sso

Configures a BGP neighbor to support BGP NSR with stateful switchover (SSO).

Technical Assistance

Description

Link

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Feature Information for BGP NSR Support for iBGP Peers

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to
www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Table 1 Feature Information for BGP NSR Support for iBGP Peers

Feature Name

Releases

Feature Information

BGP NSR Support for iBGP Peers

BGP NSR provides BGP nonstop routing and nonstop forwarding in the event of a switchover from an active RP to the standby RP.

The following commands were modified:
neighbor ha-mode sso and
show ip bgp vpnv4 all sso summary.